VTT

VTT

VTTSS

VTTOCL

C

V

t

I

´

=

VDDQ

VDDQ

VDDQSS

VDDQOCP

2

C

V

0.8

t

85 s

I

´

´

´

=

+

m

80%

87%

100%

85

µs

45

µs

UDG−04066

TPS51116-EP

SLUSB52A – OCTOBER 2012 – REVISED NOVEMBER 2012

www.ti.com

Figure 3. VDDQ Soft-Start and Powergood Timing

where

•

(2)

where

•

(3)

In both Equation 2 and Equation 3 , no load current during start-up are assumed. Note that both switchers and

the LDO do not start up with full load condition.

14

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